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The electronic structure of the heavy fermion system YbMgCu 4 was studied using synchrotron radiation photoemission spectroscopy. We observed a sharp peak of the Yb 2+ 4 f 7/2 state in a wide temperature range. The energy scale of the 4 f 7/2 peak at zero-temperature limit was estimated as |ω| ∼ 69 meV, which is in agreement with the characteristic temperature deduced from the magnetic susceptibility measurements. Our results suggest that the observed 4 f 7/2 state is associated with the heavy fermion behavior of YbMgCu 4 .